Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

Pacemaker, implantablePacemaker, implantable: A device that uses electrical impulses to regulate the heart rhythm or to reproduce that rhythm. An internal pacemaker is one in which the electrodes into the heart, the electronic circuitry and the power supply are implanted (internally) within the body.
Although there are d...

Pacemaker, internalPacemaker, internal: A device that uses electrical impulses to regulate the heart rhythm or to reproduce that rhythm. An internal pacemaker is one in which the electrodes into the heart, the electronic circuitry and the power supply are implanted (internally) within the body.
Although there are dif...

Pacemaker, naturalPacemaker, natural: The natural pacemaker of the heart is the sinus node, one of the major elements in the cardiac conduction system, the system that controls the heart rate. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulati...

PachydactylyPachydactyly: Thick fingers or toes. A feature, for example, of neurofibromatosis. From the Greek pachys, thick + daktylos, finger or toe....

PachydermaPachyderma: Thick skin, like that of a pachyderm (an elephant, rhinoceros, or hippopotamus). The adjective is pachydermatous. Pachyderma can occur in several medical conditions, such as chronic lymphedema.
From the Greek pachydermos meaning "thick skin" from pachys meaning "thick" + derma meaning "s...

Pachyonychia congenita of the Jadassohn-LewandowskPachyonychia congenita of the Jadassohn-Lewandowski
type: This is a type of
pachyonychia congenita (elephant nails from birth).
The characteristic features include:
Abnormally thick curved nails (onychogryposis)
Thickening of the skin (hyperkeratosis) of the palms,
soles, knees and elbows
White ...

Pachyonychia congenita with natal teethPachyonychia congenita with
natal teeth: This is
a type of pachyonychia congenita
(elephant nails from birth) in which teeth are evident at birth. It is called the Jadassohn-Lewandowski syndrome.
The characteristic features include:
Abnormally thick curved nails (onychogryposis)
Thickening ...

Pachyonychia congenita, type 1Pachyonychia congenita, type 1: This is a form of
pachyonychia congenita (elephant nails from birth) in which teeth are evident at birth. It is called the Jadassohn-Lewandowski syndrome.
The characteristic features include:
Abnormally thick curved nails (onychogryposis)
Thickening of the skin (hy...

PacifierPacifier: An artificial nipple, usually made of plastic,
upon which an infant can suck to gain some solace and quiet down. A pacifier is called by other names in other countries including
a "dummy" in the U.K.
Pacifiers have been claimed to cause early weaning. However, a study (JAMA, July 18, 200...